Enable high-availability functionality for the mediator in a cloud-native environment

[jleach]

To enhance the mediator's reliability and scalability, we aim to ensure it supports high-availability functionality and performs effectively in a Cloud-Native environment.

Goals:

1. Adhere to Cloud-Native Principles

   • Where applicable, follow the [12-Factor Approach](https://pradeepl.com/blog/12-factor-cloud-native-apps/) to build scalable, resilient, and maintainable applications.

2. Message Persistence

   • Ensure messages are persisted across application restarts using either Redis or PostgreSQL.

3. Horizontal Scaling

   • Enable horizontal pod scaling to efficiently manage increased load and improve performance.

4. Efficient WebSocket Support

   • Optimize for scalability and efficiently handle multiple WebSocket connections.